Paper Feed Jam (Error Code 390: Multipurpose Tray); Jam Occurs Immediately After The Power Is Turned On; (Multipurpose Tray) - Oki C710 Maintenance Manual

Oki Data CONFIDENTIAL
Check item
(4-2-4) Check the system connection
Paper feed motor Check the connection condition of the cable.
drive cable Check if the connector is connected in the half-
way only or not, and check if the connector
is inserted in a slanted angle or not. Check
also that cables are assembled without any
abnormality.
Paper feed motor Check that any cable is not pinched during
drive cable assembling of the printer.
Remove the HOPSIZE connector no. 1 of the
PU board and check the followings at the cable
side.
Short circuit between pin-1 – FG
Short circuit between pin-2 – FG
Short circuit between pin-3 – FG
Short circuit between pin-4 – FG
Paper feed motor Remove the HOPSIZE connector
PU board and check that approx. 3.4Ω can be
measured between pin-1 -pin-2 at the cable end,
and that approx. 5Ω can be measured between
pin-3 -pin-4 respectively.
43856301TH Rev.3
Action to be taken
Check work
at NG
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Replace the
cable with the
good cable
that normalizes
the connection
condition.
of the Replace the
paper feed motor.

7.5.2. (5) Paper feed jam (error code 390: Multipurpose tray)

(5-1) Jam occurs immediately after the power is turned on. (Multipurpose tray)
Check item
(5-1-1) Check condition of the paper running path
Paper running path Check if paper is jammed or not in the paper
of the multipurpose running path.
tray
(5-1-2) Check condition of the mechanical parts
Check the sensor Check if shape and movement of the sensor
levers of the paper levers have any abnormality or not.
entrance sensor 2
and the WR sensor.
(5-1-3) Check condition of electrical parts
Check the detection Confirm that the sensor signals are normally
condition of the detected by using the SWITCH SCAN function
sensor signal. of the self-diagnostic mode.
Check the sensor Check for the following signals at the FSNS
output signal level of connector
the paper entrance
Pin-2: WR sensor
sensor 2 and the
Pin-3: Paper entrance sensor 2
WR sensor.
Confirm that the above signal levels change
when the sensor lever is operated.
Check the power Check the 5V power at the CN connector
voltages supplied the front sensor board (RSF PCB).
to the front sensor
Pin-1: 5V power supply
board (RSF PCB)
Pin-5: 0VL
7. Troubleshooting and repair procedure
Action to be taken
Check work
Remove the
jammed paper.
Replace the
sensor with the
good sensor
lever.
Replace either
the PU board
or the front
sensor board
(RSF PCB)
or connection
cable.
Replace the
of the PU board. front sensor
board (RSF
PCB)
of Replace the
connection
cable.
at NG
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